1
APPENDIX B
Original Carlyle Electronic Module (CEM)
Table of Contents
Page
1.0 Overview
1
2.0 Carlyle Electronic Module (CEM) Device
2
3.0 Oil System Schematics
5
4.0 Refrigerant Management System
6
1.0 Overview – Original Carlyle Electronic Module (CEM)
Previous sections of this application manual
describe the installation and application of the
LonCEM, which became available mid-2000. The
LonCEM is an upgrade to and a replacement for
the original Carlyle Electronic Module (CEM), P/N
3TA0796B, which was provided with 05T/06T
screw compressor up to that date. For reference, a
description of the installation and application of the
original CEM is presented as an aid to service on
existing systems.
The use of this module does not eliminate the
need for the Low and/or High Pressure safety
switch(es). The functions are not included in the
module.
A voltage sensing relay with normally open
contacts should be wired to the load side of the
compressor circuit breaker, with the contacts in
series with the mechanical safeties. This is to
deactivate the module (i.e., shut off oil feed) in
case of a breaker trip.
All systems manufactured after October 1998 and
HFC systems manufactured prior to this date
should incorporate the Carlyle HK06ZB006
mechanical oil safety switch. This switch monitors
the differential between compressor discharge
and oil inlet. It will shut down the compressor if
the pressure differential is greater than 45 psi (3
bar). Systems incorporating R-22 prior to October
1998 may still incorporate the Carlyle
HK06ZB001 mechanical oil safety switch. This
switch monitors the pressure differential between
compressor suction and oil inlet. The same
mechanical oil safety switch is used for both oil
protection systems. The HK06ZB006 mechanical
oil safety switch is the only replacement switch
available. It can easily be field modified to
function as a HK06ZB001 switch by following
instructions provided. When the HK06ZB001
switch is used the pressure differential must be
monitored across the oil filters and the
compressors shut down if the differential is
greater than 45 psi (3 bar).